Issue #3260007 by mondrake, yogeshmpawar, daffie, andypost: Decouple Connection from the wrapped PDO connection to allow alternative clients

Issue #3203193 by murilohp, ankithashetty, Gábor Hojtsy, daffie, catch: Fail install if JSON is not supported by the database in Drupal 10

Issue #3136388 by dww, jyotimishra-developer, nitesh624: Fix phpdocs in core/lib/Drupal/Core/Database/Install/Tasks.php

Issue #3135629 by alexpott, dww, daffie, jungle, Rkumar, balsama, xjm: Minimum MySQL version requirement is not confirmed when upgrading existing sites from Drupal 8 to Drupal 9

Issue #3129508 by Lal_, daffie, Suresh Prabhu Parkala: Change multiple dirname()'s into a single dirname() with the use of the second parameter of dirname()

Issue #3120096 by alexpott, daffie, effulgentsia, Neslee Canil Pinto, xjm, mondrake, catch, ravi.shankar: Support contrib database driver directories in a fixed location in a module

Issue #3119017 by Gábor Hojtsy, effulgentsia, catch, daffie: Tests fail with MariaDB 10.2.7, but not 10.3.22

Issue #3109534 by TravisCarden, mondrake, effulgentsia, andypost, Gábor Hojtsy, catch, daffie, xjm: Raise the minimum MySQL version to 5.7.8 and MariaDB version to 10.2.7 in Drupal 9

Revert "Issue #3109534 by TravisCarden, mondrake, andypost, Gábor Hojtsy, daffie, effulgentsia, xjm: Raise the minimum MySQL version to 5.7 and MariaDB version to 10.2 in Drupal 9"

This reverts commit 39a54376.

Issue #3109534 by TravisCarden, mondrake, andypost, Gábor Hojtsy, daffie, effulgentsia, xjm: Raise the minimum MySQL version to 5.7 and MariaDB version to 10.2 in Drupal 9

Issue #3086374 by mondrake, alexpott, joseph.olstad, Spokje, ravi.shankar, Gábor Hojtsy, heddn, Charlie ChX Negyesi, amateescu: Make Drupal 9 compatible with PHP 7.4

Issue #82571 by asvira, Gogowitsch, flk, tstoeckler: Error message in installer mentions possibly wrong username, etc. but not port

Issue #2856362 by bpresles, Surian, WamFlying: Drupal install fail on Percona XtraDB Cluster 5.7 (pxc_strict_mode enforced)

Issue #2848812 by harsha012, gaurav.kapoor, Yogesh Pawar, Sharique, techtud, JayKandari, alexpott: Replace all calls to db_set_active, which is deprecated

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2700661 by anoopjohn: Ensure core compliance to Drupal.Commenting.FunctionComment.ParamCommentIndentation (part 1).

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2560719 by stefan.r: Remove usage of t() string in the array keys for the database install tasks

Issue #2529188 by stefan.r, reevo, vijaycs85, alexpott, Crell: Provide better error handling for MySQL client and server utf8mb4 incompatibility

Issue #2501835 by kgoel, crowdcg, stefan.r, alexpott, joelpittet, Cottser, akalata, xjm, davidhernandez, YesCT: Remove SafeMarkup::set in Drupal\Core\Database\Install\Tasks::runTasks() and ensure multiple messages are printed

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2371479 by DuaelFr: Replace inelegant string in core/lib/Drupal/Core/Database/Install/Tasks.php.

Issue #863594 by David_Rothstein, mbrett5062: Fixed Strange first paragraph in the installer database error message.

Issue #2212947 by sun, pwolanin, dmitry_bezer | ianthomas_uk: Installer doesn't pick up database port or table prefix from settings.php.

Issue #2228885 by Sweetchuck: Error message is attached to a non exists element  when table prefix is wrong.

Issue #2176131 by sun: Database configuration form in installer still uses 'db_prefix' instead of 'prefix'.

Issue #2101427 by David_Rothstein, evilehk, nod_: Follow-up: Browser validation error with Chrome on hidden required fields, even on forms that don't allow client-side validation.

Issue #1614186 by RobLoach, tim.plunkett, msonnabaum, Crell, jhodgdon, Niklas Fiekas: Update coding standards for using 'native' PHP classes like stdClass in namespaced code.